Thanks Kiyoshi for my first cover coming from Japan! The 80 yens stamp is depicting Mount Fuji, the highest mountain in Japan (3776m) and one of the most well-known symbols of the "Land of the Rising Sun".
Mount Fuji is located near the Pacific coast of central Honshu, the largest island of Japan. The Mount stands less than 100 km west of Tokyo.
To complete the franking, Kiyoshi has added two small stamps showing insects collecting nectar.